The massive bike party brought out thousands to explore the city, including the bike-curious, the costumed, and the just plain crazy. But the congestion, both for bicyclists and motorists, brought a few new concerns to light, and had many tweeting about the effort's success. Are more bikes really the answer to L.A.'s traffic problems?

At the launch of the event, Mayor Antonio Villaraigosa announced a new campaign to promote Los Angeles as an attraction for tourists who don't want to drive. Car Free L.A. offers visitors bipedal itineraries and guides for exploring the city sans motor vehicle.

Food trucks, musical performers and neighborhood guides were set up along the route. The city closed a swath of streets to cars until 3 p.m.